DSA Visualizer
Stack vs queue, step by step
Same operations, opposite order. A stack hands back the item you added most recently; a queue hands back the one that has been waiting longest.
A fixed demo sequence: push A, B, C — pop — push D — pop, pop. Watch which item leaves each time.
Empty
Step 1 of 8
Empty stack. Last in, first out (LIFO): the most recently pushed item is the first one popped — like a stack of plates.